公开(公告)号：US20110099985A1

公开(公告)日：2011-05-05

申请号：US12917179

申请日：2010-11-01

Applicant: Yuji YASUI ,  Kazuo YANADA

Inventor： Yuji YASUI ,  Kazuo YANADA

IPC: F01N3/10

CPC classification number: F01N3/208 ,  F01N2560/021 ,  F01N2900/0411 ,  F01N2900/1402 ,  F01N2900/1616 ,  F01N2900/1622 ,  Y02T10/24

Abstract: An exhaust purification system is provided that can continuously maintain a NOx purification rate to be high while suppressing the occurrence of ammonia slip. The exhaust purification system includes a slip determination portion 34 that determines the occurrence of ammonia slip based on an output value NH3CONS of an ammonia sensor 26. A reference injection amount calculating portion 31 calculates a reference injection amount GUREA—BS based on a parameter correlating to an operating state of an engine. A switching injection amount calculating portion 32 decreases in amount a urea injection amount GUREA by setting a switching injection amount GUREA—SW to a negative value in response to having determined that ammonia slip has occurred, and increases in amount the injection amount GUREA by setting the switching injection amount GUREA—SW to a positive value in response to a storage amount estimated value STUREA having fallen below a predetermined switch storage amount STUREA—SW.

Abstract translation: 提供了能够在抑制氨滑移的发生的同时，将NOx净化率连续地维持为高的排气净化系统。 排气净化系统包括：滑移判定部34，其根据氨传感器26的输出值NH3CONS确定氨的滑移发生。基准喷射量计算部31基于与氨传感器26的输出值NH3CONS相关的参数，计算基准喷射量GUREA-BS 发动机的运行状态。 切换喷射量计算部32响应于已经确定发生氨滑移而将切换喷射量GUREA-SW设定为负值，从而减少尿素喷射量GUREA的量，并且通过将喷射量GUREA设定为 响应于已经低于预定开关存储量STUREA-SW的存储量估计值STUREA，切换喷射量GUREA-SW变为正值。